Questions about **mandatory standards
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**Standards are divided into mandatory standards and recommended standards; those marked with /T are recommended standards, and if there is no such mark, then they are all mandatory standards? Are only the bold text inside the mandatory standards? Is there any interpretation for this?
Those without a “t” are mandatory standards; the text in bold within them represents the mandatory provisions that must be followed without exception
This issue needs to be addressed starting from our **entire system. The highest level is called laws; the next level consists of regulations issued by various departments; further down are standards, which are divided into mandatory standards and/or recommended standards. Regulations usually come with a notice, which can be seen once the regulations are opened; this notice specifies which provisions are mandatory. It should be noted, however, that if a departmental regulation cites a certain recommended standard, then this recommended standard becomes a mandatory one and must be strictly followed. For example, the \"Regulations on Safety Supervision of Pressure Pipelines\" is a departmental regulation issued by the General Administration of Quality Supervision, Inspection and Quarantine; it cites the \"Code for Pressure Pipelines – Industrial Pipelines\" (GB/T 20801-2006). In such cases, pressure pipelines must comply with GB/T 20801 rather than the \"Code for Design of Industrial Metal Pipelines\" (GB 50316)